Mar 3, 2011

How to Bind Data in DropDownList in Using SqlDataSource

Dropdownlist Control:
It is enables users to select from a single-selection drop-down list. The drop-down list contain "n" number of items.

The DropDownList control also supports data binding, such as data to bind the control to a data source like object data source, xml data source and sql data source, that contains the items to display in the control. This DropDownList control can be used to add data manually or even dynamically data binding from database.

DataBind Method
It is method to bind the data source to the DropDownList control

DataTextField, DataValueField Property
To specify which field in the data source to bind to the Text and Value properties of each list item in the control.

SelectedIndex Property
The SelectedIndex property to programmatically determine the index of the item selected by the user from the DropDownList control

DropDownList Syntax

<%@ Page Language="C#" AutoEventWireup="true"  CodeFile="Dropdownlist.aspx.cs" Inherits="Dropdownlist" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "">

<html xmlns="" >
<head runat="server">
    <title> dropdownlist control</title>
    <form id="form1" runat="server">
    <td style="height: 45px"><asp:Label ID="Label1" runat="server" Style="left: -1px; position: relative; top: 0px"
            Text="Name:" Width="46px"></asp:Label></td>
     <td style="height: 45px"><asp:DropDownList ID="DropDownList1" runat="server" DataSourceID="SqlDataSource1"
            DataTextField="EmpName" DataValueField="EmpName" Height="26px" Style="left: 3px;
            position: relative; top: 0px" Width="125px">
         <asp:ListItem> &lt;&lt; Select &gt;&gt;</asp:ListItem>
     <td style="height: 45px">
        <asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:masterConnectionString %>"
            SelectCommand="SELECT [EmpName] FROM [tbl_employee_profile]"></asp:SqlDataSource></td>
        <asp:DropDownList ID="DropDownList" runat="server">


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